Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (05): 450-453.doi: 10.3866/PKU.WHXB20000515

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Changes in Solvation State of Strong Polyelectrolytes in DMSO/THF Mixtures

Gao Feng, Ren Bi-Ye, Yan Yu, Tong Zhen   

  1. Research Institute of Materials Science,South China University of Technology,Guangzhou 510640
  • Received:1999-07-12 Revised:1999-10-12 Published:2000-05-15
  • Contact: Tong Zhen


The fluorescent spectra of two series of sulfonated polyelectrolytes respectively labeled with dansyl and pyrenyl groups were determined as a function of volume fraction φ THF of THF in DMSO/THF mixed solvents. When φ THF 0.65, the maximum wavelength λ em and the intensity R F relative to that in DMSO for a band of dansylated samples, as well as I 1/I 3 for pyrene labeled samples varied slightly with increasing φ THF , indicating the capability of polyelectrolyte to maintain its chain solvation stable. As long as φ THF beyond 0.70, there was an abrupt drop in R F and λ em showing the sudden change in the chain solvation layer. I 1/I 3 decreased with an increase in the charge density of polyelectrolyte samples, suggesting the existence of aggregated structure even in pure DMSO.

Key words: Dansyl, Pyrene, Polyelectrolyte, Solvation, Fluorescent spectra